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Thermal regime of sporadic permafrost in a block slope on Mt. Nishi-Nupukaushinupuri, Hokkaido Island, Northern Japan

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Title: Thermal regime of sporadic permafrost in a block slope on Mt. Nishi-Nupukaushinupuri, Hokkaido Island, Northern Japan
Authors: Sawada, Yuki Browse this author
Ishikawa, Mamoru Browse this author →KAKEN DB
Ono, Yugo Browse this author
Keywords: Permafrost
Block slope
Air circulation
Superimposed ice
Hokkaido
Issue Date: 30-May-2003
Publisher: Elsevier Science B.V.
Journal Title: Geomorphology
Volume: 52
Issue: 1-2
Start Page: 121
End Page: 130
Publisher DOI: 10.1016/S0169-555X(02)00252-0
Abstract: In this study, we discuss the predominant factors that determine the ground temperature regime of an active layer in a block slope. The distribution of the bottom temperature of snow cover (BTS) measurements, warm funnels at the top of the slope, and ground temperature changes on the block slope indicate continuous air circulation during the winter. In the spring, snowmelt water flows to the valley bottom and refreezes, adding superimposed ice onto the perennial ice that fills the voids between coarse blocks. At the study site, the ground temperatures showed a simultaneous, abrupt increase at all depths in the active layer. These results strongly suggest that air circulation in winter, as well as the ice formation processes in the spring, control the thermal regime of the active layer of the block slope with mean annual air temperature (MAAT) above 0℃.
Relation: http://www.sciencedirect.com/science/journal/0169555X
Type: article (author version)
URI: http://hdl.handle.net/2115/16958
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 澤田 結基

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